Change speed gearing



Nov. 14, 1933. CHAMBERS 1,935,018

CHANGE SPEED GEARING Filed May 1933 2 Sheets-Sheet 1 1933- J. H. CHAMBERS CHANGE SPEED GEARING Filed May 6, 1933 2 Sheets-Sheet 2 H Ch Hm bars pvvlvroQ WWW Patented 'Nov. 14, .1933

TEWSTA S PATENY'lc OFFICE This invention relatesto a change speed gear o-f'the type in which an epicyclic' trainof gearsis employed, and comprises also a driving shaft, a driven shaft, and-suitable clutches for securi'ngthe speed changes and their operation.

The object of the present invention is to de' speed gear having the features hereinafter de-- claimedin the appendedclaimsi I 7 Referring to the accompanying drawings scribed with reference to the drawings and which illustrate two embodiments of the invention by- Way of example:-'-

"Fig. 1 is a section of the gear box. I r

Fig. 2shows one of the clutch members. Fig. 3 is carrier. I r

Fig. 4 is a diagrammatic cross'section of the 7 gear box with gearing removed.

Figs. 5, 6 and 7 illustrate details of the control mechanism, and Y Fig. 8 is a diagram illustrating the-movements of this control mechanism; Fig. 9 is, a sectional view similar to Fig.2, showing a-modification of the invention, and

Fig. 10 is an end'view of the same. Referring to Fig. 1, a is the driving shaft with gear wheel I) and extension-c, splines are formed on c on whichthehalf dog clutch c is free to slide, cl is the driven shaft with extension (1 1 and 3. V The other member of this clutch isc also shown in Fig. 2;"c. when moved .totheright engages the ends of g "central position gives neutral and movement -.to theleft engages 1 with i corresponding dogs. on the'ringv member f.

5 The gear wheel b "as'shown is inconstantmesh with gear wheel is on the parallel layshaft Z, on

' this shaft. a wheel m is cut, and dogs mldrive when so required a wheeln in constantimesh with the wheel The shaft, l.revolves freely in '11. which can be moved endwise thereon and, has

An idler wheel p is an end view of the epicyclic cage or 'backward direction. I In a-modified gear box according to the invendog clutches to correspond with dogso fixed onv the casing, as Well as to the dogs m The sun-: wheel in is thus either driven or held stationary when required. 1

slidable endwise on its 0. bearing shaft and can engage m and 'outergear on the ring. 1 simultaneously, thus imparting from Z a'backward revolution to f. In orderto provide for holding the ring 1 stationary, swinging dog or double pawl 'q is provided and is made to function when the clutch member c, is in neutral. .Each member requiring movement as above must be actuated in a convenient manner .by mechanical-means and this will be described later, but the following. combinations give four .forward speeds and one reverse as follows Fourth speed or direct drive,'c ismoved to the right and engages the end of g all other clutches 1 being in neutral. 7 H Thirdspeedgor firstreduction, c is moved to the left, driving the ring f and the sun-wheel h is. held stationary by the Wheel 11 engaging the casing at o securing a reduction of, for example, about 1.5 to 1.. 1 7

Second speed or second reduction,- the ring f 9 is held by the dogs 11 whilst the sun-wheel is driven by moving n tothe left, securing a reduction of, for example, say 2.6 to 1. First speed or third reduction, the sun-wheel is driven as above but instead of holding the ring 35 memberstationary itis rotated in a backward directionby introducing the idler wheel go between in and the external gearing on the ring member 1. Thus aminus effect is produced and the sunwheel drive is converted into 'an' effective slow 9G ratio of; for example, say 5'to l. Reverse is secured by utilizing the above dee scribed slow backward revolution .of the'ring. member I "with. the sun-wheel stationary, the

clutch 0 coming into action asfor third speed, 5 I

this results in' the .driven shaft d-revolving in a tion'further or different gear :ratios :are obtained.

by varying the speed'of the-sun-wheel h or by 9 introducing an idler, similar to and which can I be similarly brought into engagement either to. rotate the sun-wheel backward or forward.

The speed of the sun-wheel-can be varied, for V of the two pairs of gears b, k, and n, i. r

In order to drive the sun-wheel in a backward direction an arrangement of gears is provided as illustrated .in Figs. 9 vand '10. .It will benoted example, byvarying the ratios of the diameters that the'arrangementshown.inthese two figures 1 l is very similar to that shown in Fig. 1 except that the external gear on the ring member f and the teeth m on the lay shaft have been omitted and the idler p has been transposed to the position 22 on a further shaft 11 This gear p acts as an idler between the wheel 2' and the wheel 11, the arrangement being such that the idler p and the wheel n are in constant mesh and both are capable of sliding together on their respective shafts p? and Z, to engage or disengage with the gear 2 When the gears 2', p and n are in mesh the gear 2' will be driven in the same direction as the lay shaft and thus in a direction opposite'to that of the driving shaft and thus when the ring member f is driven forward a slow resultant ratio is obtained according to the gearing employed.

If the ring is held stationary by the dogs q, the shaft at will be driven through the trains 22,16, n, 10 i and h, and as the sun-wheel is rotated backwards the shaft (1 will rotate in the same di: rection, thus obtaining by this arrangement a reverse drive.

In order to secure a driving connection from each end of the gear box the arrangement of the driving and driven shafts may be varied as shown dotted in Fig. 1. This variation may consist of an extension of the lay shaft Z toform a driver, Thus, through the constant clutch member 0 which can be actuated as before. In conjunction with such modificationthe driven shaft 11 can be extended through I) as shown dotted at d securing a drive as may be required, and

the wheel I) must run freely on this extension.

' The gear changes already described are brought about by the engagementand disengagement of various clutches whose movements can be secured separately by hand or by cams, but as an exam- I ple, in connection with a four speed box, I provide 40' a modified form of the usual central change hand lever universally pivoted at T Fig.1. Inthe gear described for all changes (except fourth or top speed) two part movements are required, therefore the end 2" of the hand lever r is made wide to take two notches in the actuating bars. Three bars are used, s connected to the clutch member 0 t to the gear wheel 71 through the centrally pivoted lever t 'u'is a link universaly connected to the lever T2, reference also Fig. 5, and connects through a lever 0 a small shaft 21 with part bevel v at its lower end as shown'in Fig. 4 and which engages with another part bevel v to'partially rotate the horizontal shaft w and lever to sliding the idler p itno and out of engagement. The double pawl q is free on the shaft 20 and engages the dogs formed on ;f by a swinging motion, the extension q being jointed to the bar 11..

Figs. 6 and 7 show the sliding bars 8, t and u,

each of which has a notch s and the lower end 7' of the hand lever r engages the bars herein. The bar it is slotted longitudinally as at t to receive bar wand on the side nearest the bar 3 the notch s is one-sided as at t which side with a hook't attached to the bar t projects half way across bar .9. The function of t is to engage through the swinging lever t the gear wheel n, and the engagement of s controls the clutch member fo A cam plate on the guide 5 raises the hook t on the forward movement of the bar 15 and carries this bar to neutral position. t is the usual bar retainer.

.Fi g. 8 indicates the movements ofthe lower end 1' of the hand lever r It has three definite positions x, y and 2 at neutral. The passage from finally to position 2.

r to e is clear when the notches are central, the movement x to y is a dead movement and y to 2 moves the idler 10, through the medium of the linkage already described, into mesh with the gear wheel m and ring I.

Fourth speed is secured by movement of the lever from a: to 4 on which movement bar s only is moved. For third speed the lever is returned to neutral position x and moved over to 3, this movement causes bar s to move clutch member 0 intoengagement with the ring member I. At the same time the end 1" of the lever T will also engage the side t of the slot of the bar If and carry this over, thus moving wheel 12 into engagement with the casing. For second speed the lever is first returned to at, thus carrying the bars s, and through the agency of the hook t the bar 25 to neutral; 1' is then free to move to position 3 and This movement actuates bars t and u and secures the combination for this speed. For first speed the lever is returned to y and moved over to 2 which movement brings the idler 10 into engagement, and z to Z secures the necessary combination for first speed. Reverse is secured by movement of the lever back to z, and then to the reverse position.

It is to be understood that the invention is not to be confined'to the foregoing details of construction which are given by way of example only, nor to the particular application given for the purpose of illustration since the invention may be applied to change speed gears required for purposes other than for use upon self-propelled vehicles, and may be variously modified to suit the purpose for which the gear is required or practical requirements that may have to be fulfilled. f

Having now described my invention what I claim as new and desire to secure by Letters Patent is:---

1. A change speed gear comprising in'combination, a driving shaft, a driven shaft, an epicyclic gear train having a sun and planet wheels and an outer gear ring, clutch means for alternatively connecting'the driving shaft directly with the driven shaft or indirectly thereto throughthe outer gear ring, a lay shaft rotated by the driving shaft, means 'on the lay shaft for imparting rotation alternatively to the said gear ring or to the sun wheel, and means associated with said lay shaft for holding said sun wheel stationary.

2. A change speed gear comprising in combination, a driving shaft, a driven shaft, an

.epicyclic gear trainrhaving a sun and planet wheels and an outer gear ring, clutch means for alternatively connecting the. driving shaft directly with the driven shaft or indirectly thereto through the outer gear ring, a lay shaft rotated by the driving shaft, means on the lay shaftfor imparting rotation alternatively to the said gear ring or to the sun wheel, and means associated with said lay shaft for holding said sun wheel stationary, and means for holding said gear ring stationary.

' '3. A change speed gear having in combination, a driving shaft, a driven shaft having a flange thereon, .an epicyclic gear train comprising a sun wheelloosely mounted on the driven shaft and planet wheels carried by said flange, and an outer gear ring engaging with the planet wheels, clutch means for alternatively connecting the driving shaft directly with the driven shaft or indirectly thereto through the said outer gear ring, a lay shaft continuously rotated by clutch means associated with the lay shaft forthe driving shaft, m'eansvon said lay'shaft for imparting rotation alternatively to the said outer gear ring or to the sun wheel, clutch means associated with said lay shaft for holding the sun wheel stationary, and clutch means for holding said outer gear ring stationary.

4. A change speed gear having incombination, a driving shaft, a driven shaft and having a flange thereon, an epicyclic' gear train comprising a sun Wheel loosely mounted on the'driven shaft and having another gear wheel formed therewith, planet wheels carried by said flange, an outer gear ring engaging with said planet wheels-clutch means for alternatively'connecting the driving shaft to said flange member or to said outer gear ring, or to occupy a neutral position, a lay shaft continuously rotated by the driving shaft, a second gear wheel loosely mounted on the lay shaft and constantly in mesh with the said gear wheel formed with the sun wheel,

alternatively connecting, said second gear wheel to the lay shaft, or to the fixed casing of the' gear, or to occupy a'neutral position.

5. .A change speed gear having in combination, a driving shaft, a driven shaft having a flange thereon, an epicyclic gear train,'including a sun wheel loosely mounted on-the driven shaft and having another gear wheel formed therewith, and planet wheels carried by said flange, an

planet wheels and'having gear teeth on its exterior, clutch means slidably mounted on the driving shaft for alternatively connecting the driving shaft direct to the driven shaft, or to the" outer gear ring, or to occupy a neutral position, a lay shaft continuously. rotated by the driving shaft and having gear teeth formed there-- on, an idler gearwheel adapted for engagement or disengagement with the said gear teeth on the lay shaft and the external gear teeth on the gear ring, a gear wheel loosely mounted on the outer gear ring engaging internally with the lay shaft and constantly in mesh with the said i other gear wheel formed .with' the sun wheel,

clutch means for alternatively transmitting drive from the lay shaft to said sun wheel or for holding said sun wheel stationary.

6. A ,change'speed gear according to claim, 3

upon the auxiliary gear wheel employed for the first speed and reverse; JOHN HENRY CHAMBERS. 

